as if 引导的从句用were不用was的原因,as if和as though引导状语从句

as if 引导的从句表示好像，是虚拟的假设，非真实，所以用were，而不用was

在虚拟语气的从句中，动词be的过去时态一律用were，不用was。

If I were you，I would go to look for him.

如果我是你，就会去找他。